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George, the third in line to the British throne, arrived wearing his “summer uniform,” which consisted of a blue button-down shirt beneath a navy v-neck sweater and matching shorts. The young royal will be known at school as George Cambridge.

Prince George arrives for his first day of school at Thomas's Battersea with his father The Duke of Cambridge. pic.twitter.com/B7TgcRA3Ve

The first day of school was the latest event in a momentous week for the royal family. Kensington Palace announced on Monday that Duchess Kate was pregnant with her third child, but also suffering from hyperemesis gravidarum, an acute form of morning sickness she experienced during her previous pregnancies. As a result, Kate pulled out of two public engagements earlier in the week and left royal watchers speculating whether she would be feeling well enough to take her son to school.

The Duke and Duchess are very pleased to share a photograph of The Duke and Prince George at Kensington Palace this morning. pic.twitter.com/MxcU0RqGvi

Instead, Prince William dropped off their son as planned, driving him to school in the family’s Range Rover. The two were greeted on the grounds by the head of the Thomas's lower school.

Kensington Palace marked the occasion by posting a tweet of throwback photos featuring George's father and uncle, Prince Harry, heading to their first day of school with their mother, the late Princess Diana.

Prince George stands outside the Westacre Montessori School nursery school on January 6, 2016. HANDOUT / Reuters

The family has since moved back to London's Kensington Palace as Prince William began to take on more royal duties.

After George had completed his half-day of school, William said his son had a “good day.”

"It was really nice actually. It's a nice school,” he said while attending a reception for a British soccer association.

“It went well,” he said, before joking: “There was one other parent who had more of an issue with their children — so I was quite pleased I wasn't the one.”

According to the website for Thomas’s Battersea, the facility stresses that its “most important school rule is to ‘be kind.’”

Tuition to co-ed institution is about $8,350 (6,385 British pounds) per term, according to a 2017 London-area school guide. According to the school’s website, it offers a “rich and broad curriculum” that includes art, ballet, drama, French, music and physical education. About 540 students from ages 4-13 are enrolled at the school.